Answer:
Increase in net income from further processing $ 252,000.
Step-by-step explanation:
A company should process further a product if the additional revenue from the split-off point is greater than than the further processing cost.
Additional sales revenue = Sales revenue after further processing - sales revenue after split-off point
Note that the cost already incurred up to split-off point is a sunk cost which is irrelevant for the further processing decision.
$
Sales revenue after split off point
(11,200× 70) + (5,600× 105) = 1,372,000
Sales revenue at the split off point ( 700,000)
Additional sales revenue 672,000.
Less further processing cost (420,000)
Increase in net income from further processing 252,000.